Arm rest



FIG. 1 is a front perspective view of an arm rest according to the invention;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a side elevation view thereof; and

FIG. 6 is a front elevational view thereof. 

The ornamental design for an arm rest, as shown. 